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    <title>计算器</title>
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<body>
    <body>
        <table>
             <tr>
                 <td colspan="4"><input class="screen" type="text" disabled/></td>
             </tr>
             <tr>
                 <td><input class="but but_val montage but_row" type="button" value="("></td>
                 <td><input class="but but_val but_row" type="button" value=")"></td>
                 <td><input class="but but_val but_row" type="button" value="%"></td>
                 <td><input class="but_ac but" type="button" value="AC"></td>
             </tr>
             <tr>
                 <td><input class="but but_val" type="button" value="7"></td>
                 <td><input class="but but_val" type="button" value="8"></td>
                 <td><input class="but but_val" type="button" value="9"></td>
                 <td><input class="but but_val but_column" type="button" value="÷"></td>  
             </tr>
             <tr>
                 <td><input class="but but_val" type="button" value="4"></td>
                 <td><input class="but but_val" type="button" value="5"></td>
                 <td><input class="but but_val" type="button" value="6"></td>
                 <td><input class="but but_val but_column" type="button" value="×"></td>
             </tr>
             <tr>
                 <td><input class="but but_val" type="button" value="1"></td>
                 <td><input class="but but_val" type="button" value="2"></td>
                 <td><input class="but but_val" type="button" value="3"></td>
                 <td><input class="but but_val but_column" type="button" value="-"></td>
             </tr>
             <tr>
                 <td><input class="but but_val" type="button" value="0"></td>
                 <td><input class="but but_val" type="button" value="."></td>
                 <td><input class="but but_submit but_eq" type="button" value="="></td>
                 <td><input class="but but_val but_column" type="button" value="+"></td>
             </tr>
       </table>

       </body>
       <p style="margin: 20px 750px"> <a style="font-size: 30px;font-weight:bold; " href="/list.html">查询历史结果</a></p>
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